[Solved] creating a multidimensional array javascript

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I asked you to use console.log() on the input object, because that will make it clear what you problem is:

// your (wrong) way

const indexe = 5;
const yourway = {
  indexe: {
    "input_name": 'value' // I used a string so I wouldn't have to import jQuery for this
  },
};

console.log('Your original version: ', yourway);

// using a real array, this will have a lot of undefined elements

const arrayV = [];
arrayV[indexe] = {
  "input_name": 'value'
}

console.log('Array version: ', arrayV);

// using an object correctly
const objectV1 = {
  [indexe]: {
    "input_name": 'value'
  },
};

console.log('Object version: ', objectV1);

// you can add more to it like so:
objectV1[7] = {
  "input_name": 'value'
};

console.log('After adding another entry: ', objectV1);

// you also don't need to create a new object with an already existing element. This will suffice:
const objectV2 = {};
objectV2[indexe] = {
  "input_name": 'value'
};

console.log('2. Object version: ', objectV2);

// imortant note on the object versions: length is not defined for objects
console.log('Object version 1 length: ', objectV1.length);
console.log('Object version 2 length: ', objectV2.length);

Your problem simply was that it didn’t use the value of indexe, but rather that as the name of a property. I have also included the array version, even though that is not an associative array (and as people in the comments have pointed out, neither are the object versions, really).

P.s. I used ES6 Syntax. It is rather widely supported, but I would still recommend going for at least ES5. (There are pre-processors for that)
If you want to make it ES5-valid, replace const with var and don’t use the objectV1-version.

solved creating a multidimensional array javascript